怦然心动的英文介绍可以是：

Heart Attack

Flipped

palpitating with excitement eager to do sth.

这些表达都可以用来描述一种心动的感觉，尤其是指对某人的强烈喜欢或吸引力。例如：

The voice, less coarse now, stirred her as it had then.

There are moments in adolescence when your feelings about romance turn on a dime.

All I've ever wanted is for Juli Baker to leave me alone. For her to back off -- you know, just give me some space.